Malicious PDF — malware analysis report

Static analysis result for SHA-256 e115cb8ea0be5f33…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 23:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a106bf350ccecf15c2bdb8073b3cbcd4 SHA-1: 87bc0b3a5a9e93f62d6c76286387d74f39eb600f SHA-256: e115cb8ea0be5f337f65e4213fa2c5ed9ffe8cf9c42ec71a1660bf25a0166952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://infrive.ru/uplcv?utm_term=saifurs+iba+mba+question+bank+pdf+free+download PDF link annotation
    • http://szyldkj.com/luodan/images/userfiles/file/nakuxazoridelotemu.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/qns968tar3algop6m0d5gobp4r/88027883418.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/gopibelosotezizizinef.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/mojibamofe.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/71af887f3c5cbce18dc2f71c83e85374/guganosapiwez.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/6ef503a5bdb8f5beac0fb499fbffcd39/gomuzewisovedo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ed7dd30a53aee8e82ce1161270bf9880/komexamajal.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/fafadiwexoj.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/figubujakol.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/50205816079.pdfIn PDF document text
    • http://rotang.net/userfiles/file/56262186885.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/98787245896.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d1e26edd149c131bfbb974b2285811bc/23128898118.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/nefopilebamavomum.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/najuxupug.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/tifiwuwewikemagibi.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/6e53d7cc60a5d92125705a2149d5c670/limudaketumovunijazoloka.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/rovakiwuxikojidinesipot.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/456d1ab11387acb835750fd67d7e4894/papej.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/55978822468.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/24490148234.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/52547747111.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/3opgme0cnpha7q4uil7munrupn/newavowezagituseki.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210523052021370.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/fotogobovizaxa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CB 20708 bytes
SHA-256: af3273247f18e2ca14bbdfebcca45d66131af0f6d636a77745b595d379d48ffe
font_02_sfnt_off0001107b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107B 11296 bytes
SHA-256: bafebfb403c83b57b73fb449f796a401e9431c0c98f9488e8436fa1784921fff

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